Least squares and shrinkage estimation under bimonotonicity constraints |
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Authors: | Rudolf Beran Lutz Dümbgen |
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Institution: | (1) Department of Statistics, University of California, Davis, CA 95616, USA |
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Abstract: | In this paper we describe active set type algorithms for minimization of a smooth function under general order constraints,
an important case being functions on the set of bimonotone r×s matrices. These algorithms can be used, for instance, to estimate a bimonotone regression function via least squares or (a
smooth approximation of) least absolute deviations. Another application is shrinkage estimation in image denoising or, more
generally, regression problems with two ordinal factors after representing the data in a suitable basis which is indexed by
pairs (i,j)∈{1,…,r}×{1,…,s}. Various numerical examples illustrate our methods. |
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Keywords: | |
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